Machine gun



lFeb. 14, 1939. o. voN KozURIK i 2,147,0034

MACHINE" GUN Filed sept. 2s, 1935 2 sheets-sheet 1 Feb. 14, 1939.. o, VON KOZUR'IK 2,147,003

' MACHINE GUN Filed Sept. 25, 1935 2 Sheets-Sheet 2 `Patented Feb. 14, 1939 UNITED STATES momma GUN Oskar von Komik, Vienna, Austria, assignor of one-third to Eric von third to Fritz Graf Vienna, Austria Application v3 Claims.

'I'his invention relates to improvements in machine guns or machine pistols normally operated y with explosive propellants and in which a pro- `jectile feed mechanism is attached to and `in communication withl the" barrel of the gun and a compressed air supply control mechanism is .fitted in the casingof the gun in place of the normal breech mechanism. l

The essential'feature of the present invention consists in the provision of a push rod extending into and sliding in'the barrel of the gun, an opening in the barrel through which a projectile enters the barrel in front of said push rod, a piston rod connected with and forming the extension of the rear end of said push rod, a piston fixed to said piston rod, a cylinder in the casing pf the gun and in which said piston is working, a longitudinal compressed air channel extending `through said push rod' and said piston rod but terminating in front of said piston and establlshing communication between said barrel and the interior of said cylinder in front of said piston, compressed air ports in said cylinder estab- Il shing communication between the outside and the inside of said cylinder and controlled by said piston, a compressed air supply tube attached to the casing of the gun and establishingcommunication with the interior of said cylinder behind fthe piston, a second piston xedvto said pistonrod at the rear of the piston rst mentioned and controlling lthe outlet of said tube, and spring means cooperating with said piston rod and the casing of thegun for returning the piston into its initial position. i

In view ofthe aforesaid it is possible to insert adevice for practicing firing by means of com- `jpressed air particularly in 'light machine guns and machine pistols without the necessity of any cons'tructional change to the breech case'after 40 the removal of the movable breech parts. Two modes of carrying out the present invention are illustrated byway of example on the accompanying sheets ofdrawings in which: Figure 1 is a side view of a light machine gun mounted on a stand carrying the means for operating the device for the discharge of projectiles by theuse of compressed air. 1

Fig. 2 is a crosssection taken on line II-II 'of Fig. 1. l

Fig. 3 is a. fragmentary side 4view of the tening of the fork-shaped stand. I'

Fig. 4 illustrates the projectiles-feederin longitudinal section and Fig. 5 in cross section `along line V -V of Fig. 4 respectively. f 55 fasf securely ilxed in the:barrel'and at the same time Fig. 6 is a longitudinal section through the Mischer-latta. and oney Beck-Rzikowsky, both of september 2s, 19:5, serai No. 41,791 ni mistraoetorer 1, 1934 (cl. 124-11)l projectile-feeder shown in Figs., 4 and 5. Fig. 7 shows a projectile-'feeder 'of modied construction and in longitudinal section.

As shown in Figs. 1 and 2, the machine gun is provided with the gun stock I, the breech case 2, the projectile firing device 3, inserted in the case 2 after the removal of thebreech-part. 'I'he ljacket of the gun-barrel l, rests by means of a shackle 5 on a guide bar 6, whichis slidably mounted in a'bed 1, carried by the fork-shaped stand 8 of the machine gun. Further the electromotor 3 ismounted on the bed l and its driving shaft I0 carries a' cam-shaped disc II, which causes a jerky motion by co-operating' with the stops. I2 of the slide liar 6. A bevel wheel I3 is mounted on the shaft I 3 and meshes with the bevel wheel Il transmitting the movement of the motor to the projectile firing device 3 by way of the shaft I5, the toothed wheels I8, I1 and the exible shaft I8. The trigger I9 is provided with two steps or finger grips 20 and 2|, the former being for single ring and the latter for uninterrupted firing.A According'to Figs. 4

and 5, `the projectile ring device consists of a cylindric case 22, forming the compressed air compartment 23 and connected by means of .tube 24 with a compressed air source or a pressure gas receptacle, which supplies compressed air or compressed gas of` about 6 atmospheres. pressed air compartment 23 is enclosed in an The comannular guide 25, in which'is slidably mounted a slip-ring 26, furnished with recesses 21 for the reception of the projectiles rolling-in from the projectile receptacle 2B. This slip-ring has in-` ternal air-tight connection -with theO cylindric wall 29 of the cylindric case 22 and external contact with iitting face so, provided inthe ex-f I tension 3| of thecase 22.` The opening 32 provided inthe cylindric wall 29 is closed alternately by the solid parts of the slip-ring, and opened for passing compressed air when the recesses 21 slidever the same. The extension 3| ts into j `the cartridg,chamber of the barrel 33 of the machine gun and is provided with a screwthreaded bore, into which may be screwed the insertion barrel 3 5 of the same calibre as the'projectiles to be ilred. 'I'he flange 36 oi the same rests on the jacket of the` gun-barrel 4 of the machine gun so that, `when screwing-in the insertion barrel` 35,' the projectile `firing device 4is The bore 31 of the insertionbarrel is.

the projectile receptacle 26 isitadapted to be closed ait-tight by a cap 33 and iss-supplied with compressed aix' by a small tube 39., so that the projectiles 40 fed into the receptacle, are suppliedto the recesses 21 of the slip-'ring 26 by the pressure exerted by the compressed air. Theslip-ring 26 is rotated bya worm 43 through the agencyof the flexible shaft I3. The stepwise rotation can be .carried out in con *enient manner by a' Maltese. cross. a worm with variable pitch or the like. Fastenings 4I and 42 serve for securing the fork-shaped stand. The outside shape of the/cylinder 51 of the convstructional example of the projectile feeder shown in Fig. 7 is adapted to conform to the case 55 of the various machine guns in such a manner,

thatthe device can be readily iitted in any type 'of machine-guns or machine pistols. The cylinder is provided withtwo bores 12, 13 of different diameters, the larger bore 13 being enlarged at 14 'and a sleevey 58.used as guide face ,is inserted Y' in the same and is perforated at a number of places 16 for the passage of the compressed air from one side of the piston to the other side thereof. Pistons 60 and 6i are mounted on and ilxed to the piston rod also acting as projectile Ufeeder. The part of thepiston rod 68, disposed iin front of the cylinder 51, is reduced to they caliber of the inserted barrel 54 and 4forms a .push-rod, and carries a spring washer 69 against `whichibears one end of a return compression spring 56. The other bearing is formed by a second spring washer 10, which'is.4 adjustably secured to the rear end of theinserted barrel 54 by means of' a screw thread, .thetension ofr thel spring 56 and thus the number of shots being varied by axially adjusting the said spring washer 10. The projectiles, subjected in the tubular projectile receptacle 62 to the pressure o f the helical spring 63, pass into the bore of the inserted'barrel 54 and come to rest in front of the push rod 11 of the piston rod 68.

The compressed air passes through the tube 61".

into the cylindric chamber behind the pistn'6l) and has the tendency to force the same in the direction of ring. The piston 6I cannot move forward because the same is locked by the latch or lever 52 by way ofthe piston rod 68 and the bracket 1|' connected with the rear end thereof.

The lock 'is releasedV and the piston 6I A is forced forward when the trigger is pulled. The small piston 6|! then closes the port for the admission of the compressed air, while'the rear end of the .piston 6| opens the hole 16, so that the compressed air passes through the enlarged annular chamber' 14 and through the other perforations 16 of the'sleeve 53 -intothei space in iront of the, piston 6I and, by way ofthe transverse opening- 66 and the axial bore 6I of the piston-rod 6I, enters the inserted barrel. During the forward movement of the Ipiston 61, its rod 11 pushes a projectile 65' in the inserted barrel 54 and the projectile is hurled out by the compressed air supply. Whenever 4a shot is'flred and the front ring until the trigger is released and the piston 75 rod is blocked again by the latch or lever 52.

When fitting this device in a heavy machine gun it is only necessary to provide the interposed sliding device with areturn spring because the piston-stroke in the `compressed air cylinder is siiicient for pushing backward the gun fur- 5 nished with a sliding device. Therefore the moving parts are preferably of considerable weight. Thus,.for instance, the piston and the piston rod may be provided with a core of heavy metal such as lead.

1 What I claim is- 1. In a machine gun or machine pistol normally operated with explosive propellants, a projectile .feed mechanism-attached to and in com-4 munication with the barrel of the gun, a compressed air supply control mechanism iittedin the casing of the gun'in place of the normal' breechmechanism and comprising a push rod extending into and sliding in the barrel of the gun, an opening in the barrel through which a projectile enters'the barrel in front of said push rod, a piston rod connected with and forming an extension of the rear end of said push rod. a

piston fixed to said piston rod, a cylinder in the casing of the-gun and in which said piston is,;

working, a longitudinal compressed air-.channel extending through said push rod andsaid piston rod but terminating. in front of said piston and establishing communication between said barrel and the interior of said cylinder in front of said piston, compressed air ports in said cylinder establishing communication between the outside and the inside of said cylinder and controlled by said piston, a compressed air supply tube attached to the casing of the gun and establishing 3'5 and spring means cooperatingwith said piston rod and the casing of the gun for returning `the piston into its initial position.

2. In a machine ,gun or machine pistol normaily operated with explosive propellants, -an

auxiliary liner of small caliber inserted in the barrel of. the gun, a projectile feed mechanism\ attached .to and in communication with the barrel of the ,gun or pistol, a compressed air supply control mechanism iittedl in the casing of the gun in place ofthe normal breech mechanism. and comprising a push rod extending into and sliding in the barrel of the gun, an opening in the barrel through which a projectile enters the barrel inl front of said push rod, a piston rod connected with andforming an extension of the rear end of said push rod, a piston fixed to said piston rod, a cylinder in the casing oi the gun and "in which said piston is working, -a longitudinal compressed air c lannel extending through said push rod and s d piston rod but terminating in front -of said piston and establishin'g communication between said barrel andl the Ainterior ofsaid .cylinder in front of said piston, compressed air ports in` said cylinder establishing communication between thev outside and the inside oiv said cylinder and controlled- .by s'aid piston, a compressed air supply tube at- Ationed and controlling the outlet of.sai'd tube,

and spring means cooperating with said piston rod and thecasing of the gun for returning the piston into itsinitial position.

aimons piston rod but terminating in front of said and establishing communication between said 3. Inl a machine gun or machinelpistol nory mally operated with explosive propellants, a prodi is working, a longitudinal compressed air channel extendingthrouzh said push rod and said barrel and the interior ofsaid cylinder in front o f said piston, compressed air ports in said cylinder establishing communication between the outside and the inside of said cylinder and controlled by said piston, a compressed air supply tube attached to the casing of the gun and establishing communication with the interior of said cylinder behind the piston, a second piston xed to said piston rod at the rear of the piston rst mentioned and controlling the outlet oi' said tube, andadjustable spring means cooperating withsaid piston rod and the casing of the gun for returning the piston into its initial position.

OSKAR vvon KOZURK. 

